/Engine/Source/Editor/UnrealEd/Public/Toolkits/AssetEditorToolkit.h
Adds or removes extenders to the default menu or the toolbar menu this asset editor
void AddMenuExtender ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FExtender](API\Runtime\Slate\Framework\MultiBox\FExtender) > Extender )